Labor Day marks the end of the Minnesota State Fair. If you got a chance to walk around Machinery Hill this year, you probably noticed lawmowers have replaced many of the tractors. Farm equipment that might have been state of the art at past fairs is now on display at the Old Iron Show, a farm antique show. MPR’s Lorna Benson takes a stroll through Machinery Hill with Michael Dregni, editor of "This Old Tractor."